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solve_linear_packing_problem.php
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solve_linear_packing_problem.php
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<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title></title>
</head>
<body>
<?php
session_start();
$arr = $_SESSION["array"];
$cap = $_SESSION["capacity"];
class BinPacking{
public static $solution; //solution array (which cointain will each object go)
public static $wcontainer; //container weight array
public static $totalcontainer; //no. of containers in the first instance
public static $tabu; //tabu array
public function __construct()
{
$this->arr = explode(" ", $_SESSION["array"]);
$this->cap = $_SESSION["capacity"];
}
public function bpp(){
$_SESSION["weightTooLarge"] = 0;
for($i=0; $i<sizeof($this->arr);$i++){
if ((int) $this->arr[$i] >= (int) $this->cap) {
if(isset($_SESSION["array"])) {
echo "Please check your input! One of your objects has a weight higher than the weight limit.";
echo "<br />";
}
header("location:index.php#linear_packing_problem");
}
}
self::$solution = new SplFixedArray(sizeof($this->arr));
self::$totalcontainer = round(sizeof($this->arr)*.80);
self::$wcontainer = new SplFixedArray(self::$totalcontainer);
self::$tabu = new SplFixedArray(sizeof($this->arr));
$this->fill();
$this->firstSolution();
// echo "got firstSolution\n";
// $this->tabuSearch();
// echo "got tabluSearch\n";
}
public function fill(){
for($i=0; $i<sizeof($this->arr);$i++){
self::$solution[$i] = 0;
self::$tabu[$i] = 0;
}
for($i=0; $i<self::$totalcontainer;$i++){
self::$wcontainer[$i] = 0;
}
}
public function firstSolution(){
// echo "size of thisarray: ", sizeof($this->arr);
for($i=0; $i<sizeof($this->arr);$i++){
$r = rand(0,(self::$totalcontainer-1));
if(($this->arr[$i]+self::$wcontainer[$r])>$this->cap){
$i--;
}
else{
self::$wcontainer[$r]=self::$wcontainer[$r]+$this->arr[$i];
self::$solution[$i]=$r;
}
}
// echo "out of this array\n";
if(isset($_SESSION["array"])) {
echo "<table width='20%' >\n";
echo "</table>\n
<table width='20%' border='1' cellspacing='0' cellpadding='0' >
<tr>
<td align=center>Object</td>
<td align=center>Weight</td>
<td align=center>Container</td>
</tr>\n";
$objects = array();
$weights = array();
$containers = array();
for($i=0; $i<sizeof($this->arr);$i++){
array_push($objects, $i);
array_push($weights, $this->arr[$i]);
array_push($containers, self::$solution[$i]);
echo("<tr>
<td height='40' align=center><p style='font-family: Verdana, Arial, Helvetica, sans-serif;font-size: 12px;color: #CC6600;'> ".$i." </td>
<td height='40' align=center><p style='font-family: Verdana, Arial, Helvetica, sans-serif;font-size: 12px;color: #CC6600;'> ".$this->arr[$i]." </td>
<td height='40' align=center><p style='font-family: Verdana, Arial, Helvetica, sans-serif;font-size: 12px;color: #CC6600;'> ".self::$solution[$i]." </td>
</tr>");
}
$_SESSION['objects'] = $objects;
$_SESSION['weights_bpp'] = $weights;
$_SESSION['containers'] = $containers;
echo "</table>\n";
}
header("location:index.php#linear_packing_problem");
}
public function tabuSearch(){
$tenure = 2; //TabuTenure
$actual_container = 0; //Actual container of the object
$weight_dif = 0; //TotalCap - Weight of actual_container
$weight_calc = 0; //TotalCap - Weight of the comparison container + object[j]'s weight
$w = 0;
$discarded = new SplFixedArray(self::$totalcontainer);
for($i=0; $i<8;$i++){//Instances
//First we check if a cointainer is completely full or empty, and discard them from the search
for($i=0; $i<sizeof($discarded);$i++){
if(self::$wcontainer[$i] == $this->cap || self::$wcontainer[$i] == 0)
$discarded[$i] = 1;
else
$discarded[$i] = 0;
}
for($j=0; $j<sizeof($this->arr);$j++){ //Check every object
if(self::$tabu[$j]<=$i){
$weight_dif = $this->cap-self::$wcontainer[self::$solution[$j]];
$actual_container = self::$solution[$j];
for($k=0; $k<self::$totalcontainer;$k++){//Check every container
if((self::$solution[$j]!=$k) && $discarded[$k] == 0){
$weight_calc = $this->cap-self::$wcontainer[$k]-$this->arr[$j];
if($weight_calc>=0 && $weight_calc<$weight_dif){//if the container doesn't overload and the change is better
self::$wcontainer[$k] = $this->cap-$weight_calc;
self::$wcontainer[self::$solution[$j]] = self::$wcontainer[self::$solution[$j]]-$this->arr[$j];
self::$solution[$j] = $k;
self::$tabu[$j] = $i+$tenure;
}
}
}
}
} //end for j
}
echo("<table width='20%' ><tr><td align=center style='color:#456789;font-size:300%;' >Tabu Search</td></tr></table>");
echo("<table width='20%' border='1' cellspacing='0' cellpadding='0' ><tr><td align=center>Object</td><td align=center>Weight</td><td align=center>Container</td></tr>");
for($i=0; $i<sizeof($this->arr);$i++){
echo("<tr>
<td height='40' align=center><p style='font-family: Verdana, Arial, Helvetica, sans-serif;font-size: 12px;color: #CC6600;'> ".$i." </td>
<td height='40' align=center><p style='font-family: Verdana, Arial, Helvetica, sans-serif;font-size: 12px;color: #CC6600;'> ".$this->arr[$i]." </td>
<td height='40' align=center><p style='font-family: Verdana, Arial, Helvetica, sans-serif;font-size: 12px;color: #CC6600;'> ".self::$solution[$i]." </td>
</tr>");
}
echo("</table>");
}
}
?>
</body>
</html>